Definition of better half in English:

noun

The bridegroom should be told that the girl's people having chosen him as the fittest match from among a whole lot, he should regard his wife as his better half, accord to her unflinching love and share with her all that he has.

I have the most beautiful wife. She is certainly the better half.

But if the truth be told, I simply called out to the better half: ‘Get in here love, and have a look at this face on telly’